You may use the so called "network extended user name format": [Domain Name]\[User Name]
For example you have Accounts with same User Name and with different Passwords to connect different computers (servers).
So be it, place the Domain name and BackSlash in front of the User Name:
SwissVPN\Steve
BananaVPN\Steve
WiTopia\Steve
HotSpotVPN\Steve
VPNGates\Steve
HomeCompXP\Steve
Storage101\Steve
Pay attention, in this case should be used the Backslash character ( \ ),
do NOT use the regular Slash character here.
Keep in mind the following. While you are using such "network extended user name format" against
Windows based computer, in many cases you may use not only Exact Domain Name, but something else as well. In this case, if you are using it only in order to differentiate accounts AND(!) against Windows based computer,
then the name before Backslash ( \ ) could be any. So, it could be "BananaVPN", or "Banana-VPN", ot just "Banana", whatever will make you happy ...
However, you cannot use such frivolous approach with connection to computer on other Operation Systems, like Linux, Mac or others.
In this cases you should use the correct name for DomainName. Otherwise the most probable result will be the "Authentication Error".